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<script>
    let arrayLike={
        '0':'a',
        '1':'b',
        '2':'c',
        length:3
    };
    //ES5的写法
    var arr1 =[].slice.call(arrayLike);//['a''b''c']

    //ES6的写法
    let arr2 =Array.from(arrayLike);//['a''b''c']

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